Rotary pump or blower



Sept. 2. 1924.

F. EGERSDORFER ROTARY PUMP 0R BLOWER Filed Dec. 13, 1922 2 shuts-Shen?.l

2 nl-shui 2 Sept. 2 1924.

F. EGERsDRl-'ER ROTARY PUMP OR BLOWER Fund Dec. 13. 1922 Patented Sept.2, 1924.

UNITED STATES PATENT ori-"ics,

MTARY PUMP R BLOWER.

Application led December 18, 1922. Serial Ho. 606,703.

To all whom it may concern.'

Be it known that I, FRrrz EoERsnRFER, a citizen of Germany, residing atCharlottenburg, in the State of Prussia, Germany, 6 have inventedcertain new and useful Improvements in Rotary Pum s or Blowers, forwhich I have filed an a plication in Germany; and I do hereby dec arethe following to be a full, clear, and exact description of l0 theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

My invention relates to improvements in rotary pumps or blowers, andmore particularly in pumps or blowers of the type in which a pluralityof plungers or pistons have reciprocatin movement within cylindricalpockets provided in a drum, and are engaged by a plate disposed at anangle to the axis of the plungers or pistons and adapted upon relativerotary movement of the drum and plate to operate the pistons orplungers. In machines of this type the pressure and suction ducts areprovided within a member in sliding engagement with the drum, saidmember and drum having relative rotary movement for alternatelyconnecting said pockets with the suction and pressure ducts, and thepressure and suction ducts have nearly semi-circular form. The object ofthe improvements is to provide a machine of this type in which ,thepressure ducts are successively thrown into communication with aplurality of fluid consuming apparatus without using controlling valves.With this object in view my invention consists in the matters to bedescribed hereinafter and articularly pointed out in the appendedclaims.

For the purpose of explaining the invention two examples embodying thesame have been shown in the accompanying drawings in which the samereference c iaracters have been used in all the views to indicatecorresponding parts. In said drawin s,-

Fig. 1, is a longitudinal section of the PumP Fig. 2, is across-'section taken on the line 2-2 of Fig. 1, 0 h

Figs. 3 and 4, are partial longitudinal sections taken rcspectivel onthe lines 3-3 and 4 4 of Fig. 5 and s owing a modification, and

Fig. 5, is .a cross-section taken on the line 5 5 of Fig. 3.

My improved machine may be used for example in connection with amultiple-cylind er internal combustion engine `for successivelysupplying fuel to the cylinders, and I shall describe the same inconnection with an internal combustion engine. But I wish it to beunderstood that my invention is not limited to the use in a machine ofthe class referred to.

In the exam le shown in the drawing my improved macine comprises astationary cylindrical casing z', a drum a having rotary movement withinthe cylindrical casing and formed around its axis with a suitable numberof concentrically arranged cylindrical pockets lc each having a plungerb reciprocating therein, and a disk c 1n sliding engagement with theends of the plungers, rockingly mounted by means of trunnions c', andadapted to be set by shifting mechanism d, e in different positionsangularly of the axis of the drum a. The plungers are connected by astar shaped member y having oscillating movement on a spherical pivot yformed by the end of a driving shaft g connected with the drum a forimparting rotary movement thereto, which member has the function totransmit inward movement of one plunger to the other for retracting thesame from its cylindrical pocket. The pockets k are connected with portsZ through which communication is established upon rotation of the drumalternately with suction and pressure ducts m and n. So far the machineis known in the art so that a more detailed description may be dispensedwith.

In the example shown in the Iigures, to the shaft g a disk h, is keyedwhich forms a part of the drum and takes part in the rotation thereof.The said disk contains the ports l, and the Orts are adapted forcooperation with a p urality of controlling ducts provided in the head iof the casing z', which head is in sliding contact with the disk h.

The drawing shows only one plunger b for feeding fuel, but I wish it tobe understood that ordinarily a greater vnumber of fuel plungers areprovided in order to have a uniform fuel supply, a suitable number offuel plungers being three. The suction and pressure ducts m and n areformed in the head z", m being the pressure duct and n the suction duct.As appears from Fig. 2, the said ducts are nearly semi-circular 1n form,

and upon rotation of the drum the pocket or pockets lc are successivelythrown linto communication with the said ducts. At their ends the ductsm and n are spaced apart Sulliciently to prevent communication thereofthrough the ports Z when the plunger passes through the dead point. l

In the example shown in the drawing the machine is designed for feedingfuel. to four cylinders of an internal combustion engine (not shown),and for thus distributing the fuel a circular passage 0- 1s formed inthe head z", which passage is disposed concentrically of the ducts m andn, and is connected with the pressure duct m by a passage p.Concentrically of the passage p four segmental annular passages 11 r2,r3, and r4 are formed in the head i which are adapted upon rotation ofthe disk to'be successively thrown into communication with the assage othrough a radially disposed U-sliaped passage s ormed in the disk h, andthe passages r1, r2, r3, and 'r4 are connected respectively with dischares t1, 2, t3, and t, each connected by a suitab e pipe w1th the fuelsupply of one of the cylinders of the internal combustion engine. Thesuetion duct n is connected with a suction pipe u.

Upon rotation of the drum a and the disk k the plunger or plungers bslide with their ends on the plate o, and they are reciprocated therebyin the manner known in the art. Fuel is drawn in through the suctionpipe u and the duct n and forced into the pressure duct m and thecircular passage o, from which it is distributed by means of the passages to the passages r1, r2, r3, and r4. Therefore, the same plunger orplungers during part of their travel dra-w fuel into the pocket orpockets k and during another art of their travel force previously inrawnfuel from the pockets k to the cylinders of the engine. i

In such cases in which a single plunger b is provided I provide fluidstoring means in order to have an uninterrupted fluid discharge Asshown, such fluid-storin means cons1st of a bore z', connected with t epressure duct m and containing a spring-pressed plunger z.

In my improved machine means are provided for feeding additional fluidssuch for example as Water together with the fuel. As shown the drum isformed with an additional bore or bores k having a plunger breciprocating therein and adapted to be alternately connected through apassage Z made in the disk with a nearly semicircular suction duct 'vand a nearl semicircular pressure duct fw made in the ead i. The suctionduct v communicates through a pipe m with a supply of a suitable liquidsuch as water, and the pressure duct w communicates through a radialduct p with the circular assage o, which therefore has a sup l o fueland water and transmits the saidp uids through the U-sha ed passage sand the passages r1, r2, r3, an r, to the individual cylinders. I wishit to be understood that the pocket k and cooperating parts are shownmerely by way of example, and that I do not limit myself to aconstruction in which only one subsidiary fluid is added to the fuel.

The number of the distributin passages r1, r2, r3, 1', depends on thenum er of the fluid consuming members, such as engine cylinders, and thepump can readily be adapted to any desired number of fluid consumingmembers by providing the same With a head i having the desired number ofpassages r1, r2, r3, r4. The amount of the subsidiary fluid can bevaried by providing pockets le and plungers b of the required diameter.In the example shown in the figures the diameter of the plunger b' issmaller than that of the plunger b, the plunger b being designed to adda certain amount of Water to the fuel.

In Figs. 3 to 5 I have shown a modification in which a special plunger bfor the supply of an additional fluid has been dispensed with, saidfluid being supplied by means of the main plunger or plungers b. Thegeneral construction of the pump is similar to that described withreference to Figs. 1 and 2.

As shown the shaft g2 carrying the drum 0:2 has a disk k2 keyed thereto,which disk cooperates with the head 2 formed with suction and pressureducts n2 and m2, a circular duct 02, and segmental ducts r, 1', rl, and7-8. The disk h2 is provided with a port Z2 and a U-sliaped passage s2.The operation of the parts so far described is the same as thatdescribed with reference to Figs. l and 2. As appears from Fig. 5 thesuction duct n2 is made in two sections, and between the said sectionsthere terminates a suction passage 'v2 connected through a pipe m2 Witha supply of the additional fluid .such as water.

Upon rotation of the drum a? the port l2 successively passes over thesectional suction ducts n and the terminal of the passage 112, so thatin addition to the fuel a small amount of Water is drawn in, which wateris discharged together with the fuel into the pressure duct m2. Byroviding the passage 'v2 with a terminal of t e proper area the desiredamount of Water is taken in bupon each suction stroke of the plunger 2.

While in describing the invention referenceA has been made to particularexamples embodying the same I wish it to be understood that my inventionis not limited to the construction shown in the drawings, and thatvarious changes may be made in the the construction of its parts Withoutdeparting from the invention.

' I claim:

1. In a machine of the class described,

the combination, with a frame, a drum mounted on said frame and formedwith an eccentric pocket, and means to impart relative rotary movementto said frame and drum, of a piston having reciprocating movement withinsaid pocket, a plate angularly set with respect to the axis of rotationand connected with said frame and adapted to move the piston, said framebeing formed with suction and pressure ducts adapted upon relativerotation of the frame and drum for alternate communication with thepocket, with a circular assage in constant communication with saipressure duct, and with a plurality of distributing passages adaptedupon relative rotary movement of the frame and drum tio be successivelybrought into communication with said circular passage.

2. In a machine of the class described, the combination, with a frame, adrum mounted on said frame and formed with an eccentric pocket, andmeans to impart relative rotary movement to said frame and drum, of apiston having reciprocating movement Within said pocket, a plateangularly set with respect to the axis of rotation and connected withsaid frame and adapted to move the piston1 'said frame being formed withsuction and pressure ducts adapted upon ,relative rotation of the frameand drum for alternate communication with the pocket, with a circularpassage in constant communication with the pressure passage, and withseparate distributing passages, said drum being formed with a passageadapted successively to establish communication between tlie circularpassage and the distribntin, r passages.

3. In a. machine of the class described, the combination, with a frame,a drum mounted on said frame and formed with an eccentric pocket, andmeans to impart relative rotary movement to said frame and drum, of apiston having reciprocating movement within said pocket, a plateangularly set with respect to the axis of rotation and connected withsaid frame and adapted to moveY the piston, said frame being formed witha plurality of suction ducts and a pressure duct adapted upon relativerotation of the frame and drum for alternate communication with saidpocket, a circular passage in constant communication with said pressureduct, and a plurality of distributing passages adapted upon relativerotary movement of the frame and drum to be successively brought intocommunication with said circular passage.

4. In a machine of the class described, the combination, with a frame, adrum mounted on said frame imd formed with an eccentric pocket, andmeans to impart relative rotary movement to said frame and drum, of apiston having reciprocating movement within said pocket, a plate anularly set with respect to the axis of rotation and connected with saidframe and adapted to move the piston, said frame being formed with aplurality of suction ducts liavin different supplies and a pressureduct, sai suction and pressure ducts bein@ adapted upon relativerotation of the iiiame and drum for alternate communication with saidpocket, a circular passage in constant communication with said pressureduct, and a plurality of distributing passages adapted upon relativerotary movement of the frame and drum to be successively brought intocommunication with said circular passage. p

5. In a machine of the class described, the combination with a frame,and drum mounted on said frame and formed with a plurality of eccentricpockets, and means to impart relatively rotary movement to said frameand drum, of a piston havin" reciprocating movement within each of saipockets, and a plate angularly set with respect to the axis of rotationand connected with said frame, and standing opposite one head of saiddrum, and adapted when the parts are in relative rotation to effectreciprocation of the pistons, said frame being further provided with aplate standing opposite the other liead of said drum, and having formedin it a plurality of suction ducts and a pressure duct, said suctionducts adapted to communicate with different sources of supply, one bfsaid suction ducts and said pressure duct being.r adapted upon relativerotation of the said frame and drum for alternate communication with oneof the said pockets, and the other of said suction ducts and saidpressure duct being adapted upon relative rotation of the frame and drumfor alternate communication with the other of the said pockets.

In testimony whereof I hereunto affix my signature in the presence oftwo witnesses. n f

FRITZ EGERSDORFER. Witnesses E. Hoi/rzmnuan, R. T. AUsrAcii.

